Furnace



y 1 1,615,197 Jan. 18,1927- M, F. MAY

FURNACE Filed March 16, 192i s sums-sheet 1A 21.5# d (im M. F. MAY

FURNACE Filed umn 16. 192

3 Sheets-Sheet 2 AWM.

Pneus Jan. 18 1927.

1,615,197 M. F. MAY

FURNACE Filed March 16, 1925 3 Sheets-Shui 5 LT1- A Cre lll of power supplyv Patented Jan. 18, 1927.

MMT@ STTS PATENT or Fics..

MAXWELL 1*. MAY, on rALos PARK, iLLrNors, Assren'ontrops nmnnitl rLATCHFOn-D COMPANY, or cricAGfo; LLnors; A co'RPonAToiv or rLLritos FURNACE.

Application filed March 16, 1925.

r1`his invention relates to a furnace for heating plates, billets, or other articles of the type comprising mechanism for intermittently raising the articles being heated from the floor of the furnace and carrying them forward stepby step through the heating chamber. rllhe present invention relates to improvements on the apparatus set forth and claimed in the patent granted to George ...i l). lrifhite, No. 1,596,911, Aug. Q4, 1926-. ln

this type of apparatus, a= carrier isprovided which may be lowered into recesses in the floor of the furnace, whereby-thearticlesfare supported upon the furnace floor. Means is provided for elevating the carrier whereby the articles are lifted from. the floor, subsequently the carrier, with the articles thereon, is moved longitudinally tio carry the articles forward onelstep through ythe lo furnace, then the carrier is lowered-'to again lay the articles on the furnace floor, and then the carrier is moved back beneathA the articles to its original position. Separate motor means are provided, to impart the and lowering, and; longitudinal movements to the carrier.

The principal object of this present invention is to provide automatically operating controlling connections between the source and the two motors for moving' the carrier, whereby the motors will be successively operated in a. predetermined order to move the carrier through a predetermined fixedl path.

:isi Another object is to provide means `for imparting an initial movement to the controlling connections, whereby the carrier will be moved through one complete cyclca-nd returned to its originalposition offresi?.

Another object is to provide closures for the entrance and exit openings at the ends of the furnace, and motor` means for operating` these closures, which 'are so connected with the means for raising and lowering the 'Vf carrier that the closures will be elevated; or

opened before the carrier is elevated and closed after-the carrier is lowered.

Numerous other4 objects and advantages of this invention will be apparent from-the I" following detailed description of one; ap-

proved form of the apparatus.

In the accompanying drawingsz' Fig. 1 is afront elevation or theV furnace. Fig. 2 isa transverse vertical sectiontalen substantially on the line 2-2 of Figg.

Serial Np. 16,059,

Fig. 3. is a longitudinal vertical section taken substantially on. the line 3.-3: of

Fig.'` 4 is` an enlarged detail. view, partly in section, off; one of the controllingvalves for the translating motor- Y F ig., 5 is a combination plan view and horizontal section, the, upper portion of the figureV beingv taken substantially Hon thel line 5-5 of Figs. 2 and 3. Portionsgofg the mechanism in the lower half of Fio. 5 are shown enlarged and diagraiinnatically arranged to facilitate the disclosure. p

Referring tol the drawings, 1 designates thel floor.- or the furnace, which is formed with longitudinal` slotsor recessesQ in which operate a portion of the mechanism for movingthe plates, or other articles, through the furnace.

The side walls` of the furnace shown at 3, are provided with tuyeres 4 for the admission of.y fuel in the-form of gas or oil for heating the interior of. the furnace. rllhe cover arch isshown at 5^, 6 is the front wall providedwith an opening, 7 through which the articles are placed within the furnace, and 8 is the rear wallfprovidedl withan exit openingf) through which the Aarticles'emerge from the furnace. A, tablefor receiving th'e hot articles after they arecarried from the furnace is indicated in dottedflinesat 10, Fig. 3. The furnace, it. willbe understood, may be ofy any suitable construction, my inventionbeing concerned principally` with themechanism for intern'iittently moving the plates, billets, lor other` a `ticles, through the furnace. Y y

The conveyor mechanism comprises a carrier, preferably consisting of a number oflongi-tudinally arrangedpipes 11 extendingthrough the slots 2 in the floor of the furnace, and connected.v together` at their ends,.outsideof the f urnace,.by cross-beams 131l and byV header pipes i12 provided` with y flexibles hoses for` circulating water through n." LA

no. Ulr

(lli

as I-beams, are suspended by straps 17 from links 18, the upper ends of which are pivoted to the arms 19 of bellcranks 20 lixed to rock shafts 21, mounted in bearings 22 at the top of the furnace structure. It will be understood that one of the bellcranks is secured near either end of each rock shaft 21, which extends transversely across the furnace. The upstanding arms 23 of the bellcranks are connected by links 24, so that all of the bellcranks turn in unison to raise both ends of both ofthe transverse members 14 simultaneously. A third arm 25A on one of the rock shafts 21 is connected by means of a downwardly extending link 26 with a fluid pressure operated motor A. As here shown the motor A is in the form of a lluid pressure cylinder 27 in which operates a piston connected by piston rod 28 with the link 26.

The carrier 11-is moved forwardly while in its elevated position, and in the opposite direction or backwardly when lowered into the floor recesses .2 by means oit a second fluid pressure operated motor B. The motor B comprises a double acting fluid pressure cyl inder 29, in which operates a piston 30 connected by piston rod 31 to a lever 32, the lower end of which has a slotted pivoted connection 33 with an anchorage 34, and the upper end of which has a similar pin and slot connection 35 with a bracket 36 on the carrier 11. The connection 35 comprises a rather long slot 37 in the lever 32 in which operates a pin or roller 38 carried by the bracket 36. The increased length of slot 37 is to make provision for the raising and lowering of the carrier and for its longitudinal movements at both level-s.

In the operation of the mechanism as thus far described, and with the parts in the initial position shown in the drawings, inotor A will be operated to move the piston rod 2S downwardly, thereby through link 26 swing the bellcranks 20 and elevatingr the carrier structure 11 by means of the links 18. The operating lever being in the inclined position shown in Fig. 3, the engagement ol pin or roller 38 with slot 37 will cause the carrier 11 to move diagonally upward until the pipes of the carrier litt the articles formerly resting upon the floor 1 of the urnace. Motor B will now be operated to draw the piston rod 31 into the cylinder 29 thereby swinging operating lever 32 over to the other side of its fulcrum 33 and moving the pipes 11 and the articles carried thereby longitudinally through the furnace toward the rear end thereof, the pipes 11 moving lreely over the rollers 16 on supporting means 14. The pressure fluid is now exhausted from the cylinder 27 olI motor A and the carrier is moved by gravity into the recesses 2 01"' the furnace floor, depositing the articles on the floor but each at a point a step in advance of its former position. Double acting motor B is now operated to swing the lever' 32 bacl-z to the position indicated in Fig. 3, thereby translating the pipes 11 in the opposite direction along the supporting rollers 16 until they are again in the position in whicu they were Vlfound at the beginning ot the cycle vo'lAI operations just described. During this linal translating movement the pipes 11 move in the slots or recesses 2 beneath the articles in the furnace, but out of contact therewith, so that no movement is imparted to the articles. By successively imparting, at de sired intervals ol time, to the carrier 11 the cycle ot movements just described, the urticles inserted into the turnace through the 'l'ront opening 7 are gradually moved step by step through the furnace until they emerge through the rear exit opening 9 onto the delivery table 10. All oi the mechanism thus iar described is substantially the same as disclosed in greater detail andv claimed in the patent to White, noted hereinabove.

l'n'order to conserve heat and provide more even temperature conditions within the furnace, it is desirable that the openings 7 and 9 in the ends of the furnace be closed as much oi the time as possible. For this purpose, I have provided closures 39, here shown as a plurality of vertically slidable gates oi blocks 40, connected by a iframe structure 41 to move vertically in unison in front ot' the opening 7 or 9. 'lhe closures at each end of the furnace are substantiel?" indent-ical, and a description ot one will s lice for both. The central panel ot the closure 39 is suspended from one end oit a chain or cable 42 extending over guide rollers 43 and 44 at the top ol the furnace structure and carrying at its other end a counterweight 35. A second looped cable or chain 46 has its ends connected at 47 to the two end panels et the closure, the chain passing` over guide rollers 4S, 49 and .i0 and cari-yur in its downwardly extending loop a roller l by means ot which is suspended the counterweight 52, connected to the upper end et a piston rod 53"ot a fluid pressure operated motor C or C', the two motors C and C being indentical and one operating cach o the two closures 39. ViThen fluid under pres-- sure is admitted to the cylinders ot' the motors C and C. piston rods will be drawn downwardly and through the chain or cable 46 will elevate the closures 39. When the Huid pressure is exhausted from the cylinders 54, the closures 39, which somewhat outweigh the counter-weights and 52, will return by gravity to their initial positions closing the openings 7 and 9.

It will be noted from Fig. 5 that the pipe 55 which supplies fluid under pressure to the cylinder 27 ot the lifting motor A, has an extension 56 leading to the cylinders iii ivi

n -r al) of the closure operating motors C and` C. The numeral 57 indicates throttle valves -n the feed pipes leading to the cylinders 5l, these throttle valves being normally fully open. Another throttle valve 58 is positioned in the feed pipe leading to the cylinder of motor. A, and this throttle valve will be partially closed so as to restrict the flow of fluid under pressure to the cylinder 27. 'lhe purpose of 'this is to cause the motors C and C tooperate more promptly than the motor A, so that when fluid under pressure is simultaneously supplied. through pipe to these three motors, the closures 39 lwill be raised somewhat more rapidly than the carrier ll, thus avoiding any interference between these parts and permitting the carrier pipes to be lifted up into they openings 7 and 9 and out of the slots or recesses 2.

fl have providedv av series of valves and connectionsr whereby` the motors and D are successively. operated in a predeterminelfl order to impart a Cycle ofI movements to the carrier ll, whereby vit ismoved through the closed path or orbit hereinabove described. These `autonratic controlling connections comprise a valve means D. for controlling lifting motor A, and a pair of cooperating valve means E andv F for controlling the translating` motor B. A manually operated master valve or controller G, is designed to initiate the automatic cycle of operations whenever' a movement of the-articles through the furnace is thought. tofbe desirable. The master controller G might lbe operated mechanically, by any suitable mechanism, to cause the operation of the` carrier at regular intervals of time.

As shown in Fig. 5, controllerA G is in the form of any ordinary three-way valve provided with an operating handle 59. h(lne pipe connection vGO extendingfrom valve (l leadsto the main fluid press r-e supply'pipe (il. Pipe Gl is in constant communication with any suital'ilesourceof 'fluid under pressure. rllhe opposite pipe connection o" valve D is open to the` air to serve as Van exhaust vent. rlhe intermediate pipe connection G3 leads to the cylinder (Se of a small fluid pressure motor carri ed by braclret (l5, and having an1 operating piston 6G. When vulve D is in the normal: position shown in Fig. 5, the` port 6 7 inv the valve will connect pipe 63-with exhaust 62,so that cylinder 64 is openf to lnormal atmospheric pressure. In order to initiate a cycle of movements of, the carrier, cam lever 59 is momentarily moved to the dotted line position (,Fig.v 5), andthen,returned toits original full line position. Vlhile moved to the dotted, line position, pipe 63 will be temporarily in communication through pipe GO withlthe source of fluidsupply, and the pressuietlius delivered to cylinder 64. will push out lthe pistony 66.

Thek outer end 67 of piston G6- bears against one arm 68 of a bellcranlr lever, the other arm 69 of which has a pin and slot connection 70 with the piston'rod- 7l extending from the piston 72 of the valve D. Cylinder 73 of valve D has inlet ports 74 and 75 adjacent either end thereof, t ieee ports being connected through pipes 7 6, 77 and 78 With the main supply nipe 61. ln this way the valve D isbalanced by a constant supply of equal;l fluid pressure against each end ofthe piston 72. The centralportion of piston 72 is cut away to provide an annular space 79 which is always in communication with an exhaust port S0 in Vone side of cylinder 73. The supply pipe 55 for the liftingl motor fr and the closure operating motors GandI C, communicates with port 8l in'one side of valve cylinder 73. When valve D is in the position indicated in Fig. 5, supply pipe 55 is in communication with the annulail space 79 in piston 7 2, and thence in communication with exhaust port 80. whereby the cylinders of motors A, C and C are exhaust-ed by being open to the atmosphere. vVhen the master control valve G operated, luneinabove described, to momentarily admit fluid pressure into the cylinder-i (lll, the mov thus inipartedv to piston G61, bellcranl; (33 and G9, and piston rod'7l, will. move the piston 72 to theleft, Fig. 5, into the dotted line position, so that pipe 55 is now cut off from the eXhaustB() nut is in communication with the main supply pipe 6l, through pipes 78, 7,7, and port 8l. Fluid under pressure will now be admittedv directly to the cylinders of motors A, @and C", whereupon the closures 39 'will' first he elevated, directly followed bythe carrier il.

` Referring now moreiparticularly 'to Figs. 3 and 4, it will be notedathat the controlling).` valve E for the translating motor' B is of much the same type valve D previously described. A continuation of the main fluid pressure supply pipe (ll is in co minication through branchesl 32 and 83, with the inlet ports 84e and 35' near either end of the valve cylinder SG, whereby the pref-sure against the ends of piston'l is initially balancedy at allftimes. il p )e 83 is in communication Vith one outlet port 89Inearfone end of the cylinder 86, and-another pipe 90 is in communication with a similar outlet port 91 near the other end of the cyli1 An exhaust port 92` aireuigedA centr one wall of cylinder Sois in con-stan munication with the annular. spac 9o formed by cutting' away the central portion of piston 87. Pipe 90 leads to the inlet port at the far` end of cylinder 29 of translating motor B, and with the parts in the positions'shown in the drawings there is a free passage vfor fluid 4under pressure from supply pipe 61 through pipe 83, inlet port 85,

lll() cylinder 8G, outlet port 91, pipe 90 to motor cylinder 29, so that the fluid pressure is bearing against the rear face of piston and holding the piston rod 81 extended and lever rod 82 in the position indicated in Fig. 8. Pipe 88 leads to one )ort 9st of the ordinary four-way valve F. The pipe leads from another port 96 of this valve F to the opposite inlet .port of cylinder 29 of motor B. The third port 97 of valve F, opposite port 9a, is in communication with an exhaust pipe 98. The fourth port is preferably closed by a plug 99 as shown in Fig. 5. The oscillatable inner body portion 100 of the valve F is provided with two arcuate cutaway portions 101 and 102, and with the valve in the position indicated in Fig. 5, the cutaway portion 101 places pipes 88 and 95 in communication with one another. When valve body 100 is rocked into the dotted line posit-ion, the cutaway portion 102 places pipe 95 into communication with the exhaust 98. lVith the parti-il in the posit m shown in the drawings, the front end of cylinder 29 of motor B is exhausted to atmospheric pressure through pipe 95, valve F, pipe 88, annular space 98 and exhaust port 92 of valve E.

An arm 108 projects laterally from one side of the link 2G of lifting motor A., and this arm 108 is connected through link lll-l with a vertical slide rod 105 operating through guides 106 and 107 projecting from a portion of the lixed framework. A pistou rod 108 projects upwardly from the piston 87 of valve E, and a forked arm 109 projecting laterally from this piston red 108 en'ibraces the slide rod 105 between a pair of spaced stops 110 and 111 secured adjustably t-o the rod 105. V7 hen motor A is operated to elevate the carrier 11, link 26 will be moved downwardly, thereby pushing down the slide rod 105, and near the end of this movement stop 111 will engage the forked arm 109 and through piston rod 108 shift the piston 87 into the lower dotted line position indicated in Fig. l. rThis movement of the piston 87 will cut off the pipe 90 from communication with the fluid pressure supply and place this pipe in communication with the exhaust port 92, thereby eX- hausting the rear end of cylinder 29 of motor B. At the same time pipe 88 leading to the other end of cylinder 29 of motor B will be placed in communication with the supply pipe 61 through pipe connections 82 and ports 8d and 89. Fluid pressure thus being delivered against the other or front side of piston 80, the motor B will operate to swing the operating lever 82 to the other end of its arc of travel thereby translating the pipes 11 V(which are now elevated and supporting the articles within the furnace), rearwardly one step through 55 the furnace.

An arm 112 projects laterally from the end of piston rod 81 of motor B, and the free end of this arm loosely surrounds a slide rod 118, slidably through i'ixed bearings 114-. is the piston rod 81 is drawn into the cylinder 29 during the translating move-- ment of motor B just described above, the arm 112 will engage an adjustably fixed stop 115 on slide rod 118 and draw this rod 118 along in the same direction as the translating movement of the piston rod 81 and carrier 11. Slide rod 118, which is made in sections connected by a safety spring 116, is pivoted its end 117 to the fulcrum of a bellerank lever, one arm 119 of which .-f

is pivoted to the operating crank arm 120 for the rocking body portion 100 of valve A sprii'ig` 121 connecled at one end to thc crank arm 120 and at the other cnil to an adjustable anchorage 122, normally holds in" the valve F in the position indicated in Fig. 5. The second arm 128 of the bell crank is engaged with a slide block 124` loosely mounted on a link or rod 125, which is pivoted at one end 126 to a third arm 127 the bell crank 127, 69 and move the piston 72 of valve l) back to the fnll line position indicated in Fig. 5. At the same time the other arm 119 of the` movable beller-ank will, through crank arm 120, swing the valve body 100 of valve F into the dotted line position placing pipe 95 in communication with the exhaust 98 and stopping the flow of fluid from pipe 88 to cylinder 29. Pipe 55 is new in communication with the exhaust port 80, and the carrier 11, and the closures 89, will sink by gravity to their lowered positions. The articles carried by the pipes 11 will again be laid upon the floor 1 of the furnace, but in positions advanced one step toward the rear of the furnace from their former positions.

As the carrier 11 moves downwardly, the rod 105 will be drawn up until stop 110 engages the arm 109 and the piston 87 is shifted back to its original full line position as shown in Fig. 1. This again places pipe 90 in communication with the main supply pipe 61, and fluid pressure. is again delivered to the rea-r end of motor D, and since the front end of this cylinder is in communication through pipe 95 with one exhaust port 98, the piston 80 will be moved back toward the left, (Fig. 8), thereby returning the carrier pipes 11, which are now nested within the slots 2 of the furnace Il,

back .to their originalpositions `as shown in full lines (Fig. 3).y rlhis movementof pistjon rod 31 will release the arm 112 from engagement with the adjustable stop or col.- lar 115 of rod 113, Iand the spring 121 will then swing the crank 120 and valve body 100 back to the original solid line positions, as shown in Fig. 5. The stop collar 115 is made` adjustable, it will be understood, so that the inward strolie of the piston and consequently the length ot travel o the articles through the furnace atveach cycle ot operations, may be varied. That is `by shitting valve body 100 earlier or later, which will depend on the position of collar 115 on rod 113, air pressure may be cut otlz from the` translating cylinder 29 at different points in the travel o1' piston 30 so as to vary the length of the movement of the articles through the `furnace as may be desired.

This completes one cycle ot operations, and it will be noted that all of the moving parts have been returned to their original positions, which they occupied before this -series oi' movements was initiated by the manipulation of master control valve Gr. It will be noted that after the iirst manual manipulation of the handle 59 ot' valve G, which requires no especial slill whatever, the operation of the apparatus is entirely7 automatic until one complete cycle oft movements have been completed, Obviously any suitable timin mechanism might be employed to actuate the valve (l at desired intervals, thus rendering the operation ot"A the .apparatus entirely automatic but such operation is not preferred for large articles especially since it is best to have some skilled operator to determine the length oit the periods between forward movements oit the articles through the furnace so `as to discharge the articles at the proper temperature. By means of the prelerred apparatus shown, the moving parts of the conveyor mechanism come to a stop automatically after cach cycle of operations and remains stationary until reactuated by manual operation of the master valve Gr.

I claim:

.1. In combination with a fur11ace,meclianism 'for moving bodies intermittently through the furnace comprising a carrier, means for raisingand lowering the carrier, means for imparting longitudinal movements to the carrier alternately in opposite directions, means whereby the'amplitude of said longitudiiurl movement may be varied, and a single controlling means ior actuating the two mentioned means in a predetermined order.

Y ln combination with a furnace, mechanism .for moving bodies y intermittently through the turna-ce comprising a carrier, means for raising and lowering thecarrier, means ton imparting longitudinal movements to 4the carrier alternately in opposite directions, and a fluid pressure actuated controlling means comprising a manually operable valve for causing the successive operationv of thetwo iirst mentioned means solas to impart a predetermined cycle ot movements to the carrier.

in combination with a furnace, mechanisiu `for i'noving bodies intermittent-ly through the furnace comprising a carrier, means for raising and lowering the carrier, means 'lio-r moving the carrier longitudinally in one direction when the carrier is raised, and for moving it longitudinally in the opposite direction when lowered, and controlling means adapted ,to be actuated by hand f tor causing the operation ot the two first mont-ionedzvmeans in such order that rthe carrier willbe moved through a predeterminedv `closed pathL and will then remain s i tionai'y until the controlling means is again actuated.

4i. In combination with aiiurnace, mechanism for moving bodies intermittently through the furnace comprising a carrier7 means for raising and lowering vthe carrier, means for moving the carrier longitudinally in one vdirection when the carrier is raised, and ifor moving it longitudinally in the opposite direction when lowered, and controlling means comprising a member movable at willoli the operator for causing 'the operation ltlieftwo tirst mentioned vmeans in such order that the carrier will be moved once through a predetermined closed path and will then bey stopped when in its initial position and remain stationary until the controlling means is reactuated by another movement oi' ysaid movable member.

ln combination with a furnace, mechanism for moving bodies intermittently through the furnaceycomprising a carrier, motor means for raising and lowering the carrier, motor means for imparting longitudinal movements to the carrier, means whereby the amplitude of said longitudinal movements may be varied, a source of power orenergizing the motors, and controlling connections between the source ot power and the motors whereby the motors will be successively operated to move the carrier through a predetermined closed path.

(3.` ln combination with a furnace, mechanism for moving bodies intermittently through the furnace comprising a carrier, motor means for raising and lowering the carrier, motor means tor imparting long itudinal movements to the carrier, a source of power `for energizing the motors, control-- ling connections between the sourceA ot power and the ,motorsy and means comprising a control-ling member movable at will et' Vthe operator for effecting a single cycle only ot movements of these connections whereby the motors Jwill be successively operated to move the carrier through a predetermined closed ico path and return it to the original position of rest.

7. ln combination with a furnace, mechanism for moving bodies through the furnace comprising a carrier, means for aising and lowering the carrier, separate means for translating the carrier, means whereby the amplitude of the translating movements of the carrier may be varied and controlling connections for actuating the elevating and translating means in such a predetermined order as to impart a definite cycle of movements to the carrier.

8. In combination with a furnace having entrance and exit openings, fluid pressure operated means for moving bodies intermittently through the furnace, closures for said openings, fluid pressure operated means for moving said closures away from said openings, a source of supply of fluid under pressure, supply pipes therefrom to said fluid pressure operated means, and retarding means in the pipe leading to the fluid pressure means for moving the bodies through the furnace.

S). In combination with a furnace, mechanism for moving bodies intermittently through the furnace comprising a carrier, a fluid pressure operated means for raising and lowering the carrier, a second fluid pressure operated means for moving the carrier longitudinally in one direction when elevated and in the opposite direction when lowered, means whereby the amplitude of said longitudinal movements may be varied, a source of fluid under pressure, and a system of valves for causing the successive operation of the two pressure operated means to impart a predetermined cycle of movements to the carrier.

l0. In combination with a furnace mechanism for moving' bodies intermittently through the furnace comprising a carrier, a fluid pressure operated means for raising and lowering the carrier, a second fluid pressure operated means for moving the carrier longitudinally in one direction when elerated and in the opposite direction when lowered, a source of fluid under pressure, a system of valves for causing the successive operation of the two pressure operated means in a predetermined order, and a master control valve for initiating a series of operations of the valves and pressure operated means whereby one complete cycle of movements onlyv is imparted to the carrier.

1l. ln combination with a furnace, mechanism for moving bodies intermittently through the furnace comprising a carrier, a fluid pressure operated motor for raising and lowering the carrier, valve means for controlling the operation of this motor, a second fluid pressure operated motor for moving the carrier longitudinally in one direction when elevated and in the opposite direction when lowered, valve means for controlling this second motor, a source of fluid under pressure, and means momentarily operated for imparting an initial iovement to the first mentioned valve means, whereupon the valves and motors are successively operated to move the carrier through a single cycle of movements and return it to the first position of rest.

l2. In combination with a furnace, mechanism for moving bodies intermittently through the furnace comprising a carrier, a fluid pressure operated motor for raising and lowering` the carrier, valve means for controlling the operation of this motor, a second fluid pressure operated motor for moving the carrier longitudinally in one direction when elevated and in the opposite direction when lowered, valve means for controlling this second motor, a source of fluid unoer pressure, fluid pressure operated means for imparting an initial moven'ient to the first mentioned valve means for causingthe first motor to elevate the carrier, and connections between the carrier elevating means and the second mentioned valve means for causing a longitudinal movement of the carrier after it is elevated.

13. In combination with a furnace, mechanism for moving bodies intermittently through the furnace comprising a carrier, a

fluid pressure operated motor for raising and lowering the carrier, valve means for controlling the operation of this motor, a second fluid pressure operated motor for moving the carrier longitudinally in one direction when elevated and in the opposite direction when lowered, valve means for controlling this second motor, a source of fluid under pressure, fluid pressure operated means for in'iparting an initial movement to the first n'ientioned valve means for causing the first motor to elevate the carrier, connee-tions between the carrier elevating means and the second mentioned valve means for causing a longitudinal moven'ient of the carrier after it is elevated, connections operated by the second mentioned motor for il'ioving the first mentioned valve means to lower the carrier, the first mentioned connections operating when the carrier is lowered to more the second mentioned valve means whereby the carrier is moved back longitudinally to its original position of rest.

14e. In combination with a furnace having a recessed fioor, mechanism for moving bodies intermittently through the furnace comprising a carrier which, when out of engagement with the bodies is lowered within the floor recesses, means for lifting the carrier from the recesses into engagement with the bodies, means for translating the carrier with the bodies when elevated, and for returning the carrier when lowered to its flfl original position, and means adapted to be made operative only momentarily to control the successive operations ot the two fst n'ientioned means so as to impart a single cycle oi' movements only to the carrier.

l5. ln combination with a furnace having a recessed tloor, mechanism 'for moving bodies intermittently through the ifurnace comprising a carrier which, when out o' engagement with the bodies is lowered within the .lioor recesses, means for lifting the carrier ilroni the recesses into engagement with the bodies, means tor translating the carrier with the bodies when elevated, and for returning the carrie1 when lowered to its original position a manually movable controlling` member, and a series voit cooperating connections lior causing the successive operation of the two lirst mentioned means in such .an order as will move the carrier through one complete cycle only and ad- Vvance the bodies one step through the turnace.`

16. In combination vwith a 'furnace having a recessed floor, mechanism ttor moving bodies intermittently through the tur acc comprising a carrier which, when out of engagement with the bodies is lowered within the iioor recesses, a 'fluid operated motor tor lifting the carrier ilrom the recesses into ongagcn'icnt with the bodies, a second 'lluid operated motor for translating the carrier with the bodies when elevated, and tor returning the carrier when lowered to its original position a manually movable controlling member, and a series of cooperating valves for causing the successive operation of the motors in such an order as will move the carrior through one complete cycle only and return it to the original position.

17. ln combination with a 'furnace having a recessed door, mechanism iior moving bodies intermittently through the YFurnace comprising a carrier which, when out oit engagement with the bodies is lowered within the tloor recesses, a fluid operated .motor lor litting the carrier from the recesses into engagement with the bodies, a second fluid operated motor for translating the carrier with the bodies when elevated, and for returning the carrier when lowered to its original position, a series ot valves for controlling the motors, and fluid pressure means lor operating said valve whereby the motors will be successively operated to impart a predetermined cyclo olli movements to the carrior.

lli. In combination with a furnace having` a recessed door, mechanism 'lor moving bodies intermittently through the furnace comprising a carrier which, when out ot engagement with the bof ies is lowered within the floor recesses,

a. lluid operated motor it'or lifting the carrier Yfrom `the recesses "ir"o engagement with the bodies, a second il l operated motor for translating the carrier with the Abodies when elevated, 'and for returning the carrier when lowered to its original position, a series or' valves 'for cont-rolling the motors, automatically operating connections between the valves and movingl parts of the apparatus, and a manually operated means for imparting an initial movement to the controlling` `connections whereupon the motors will be successively operated in a predetermined order to impart one conn plete cycle ot movements only to `the carrier, moving it through a predetermined closed path and returning it to the starting position.

i9. ln combination with a. furnace, mechanism for conveying bodies through the tdrnace by step by step movements, closures it'or the entrance and exit openings the 1furnace, and automatic means comprisinf' g a controlling member movable at the will ot the operator, which when moved. eiiects a series ot operations, consisting in the movement ot the closures away trom said ngs, a single forward movement oli the bodies through the furnace and the movenient of the closures acr ss said openings.

QOL ln combination with a `furnace, a car rier, a fluid pressure lifting cylinder tor he carrier, a liuid pressure translatinc' cylinder .'t'or the carrier, a valve to control the flow ot tluid to one end of' the translating cyllinder, a valve E to control flow of fluid to the other end of the translating cylinder and to valve F, a valve D lior controlling the flow or" fluid to the lifting cylinder, a Huid pressure motor for shifting valve D in one direction, said valve D being moved in 'the other direction by thepiston of the translating cylinder, a valve G Jfor controlling the flow ot fluid to the iluid pressure motor, and means actuated by the movement ot the piston of' the lifting cylinder for shitting valve lll.

21. In combination with a `furnace, a carrier, a Huid presure litt-ing cylinder for the carrier, a. iiuid pressure translating cylinder tor he carrer, a valve F to control the liow of fluid to one end of the translating cylinder, a valve E to control the flow of' fluid to the other end ot the translating cylinder and to valve l?, a valve D for controlling the llow of fluid to the litt' cylinder, a

fluid pressure motor Jfor shi tting valve l) in one direction, said valve l) being moved in the other `direction by the piston oit' the translating cylinder, a valve G for controlling the flow ot fluid to the lluiil pressure motor, means actuated by the moveme ot the piston oi: the lifting cylinder tor shitting valve E, a door, a lifting cylinder -for the door, supply pipes leading to the two lll lifting cylinders, and a throttle valve in the pipe leading to the lifting cylinder for the carrier.

22. In combination with a ,furnace open at either end, closures for these openings, a fluid pressure operated motor for opening and closing the closures, mechanism for moving bodies intermittently through the furnace from one end to the other comprising a carrier, a fluid pressure operated motor for raising and lowering the carrier when the closures are open, a fluid pressure operated motor for imparting longitudinal movements to the carrier in one direction when elevated and in the opposite direction when lowered, and a Huid pressure operated means fer controlling the different motors whereby the closures will be moved to open position before the carrier is elevated, and will be closed after the carrier is lowered.

In combination with a furnace open at either end, closures for these openings, motor means for operating the closures, mechanism for moving bodies intermittently7 through the furnace comprisinga carrier, meter means for raising and lowering the carrier, and operating connections between the two motor means whereby the closures will be moved to open positionl before the carrier is elevated, and will be closed after the carrier is lowered.

Q4. In combination with a furnace open at either end, closures for these openings,

Huid pressure operated motor means for moving the closures, mechanism for interinittently moving bodies through the fui'- nace comprising a carrier, fluid pressure operated motor means for raising and lowering the carrier, a common supply pipe for the two motor means, valve means for controlling the flow of tiuid under pressure to the motors. and means for restricting the flow of fluid to the raising and lowering motor whereby the closure will be opened before the carrier is elevated.

25. In combination with a furnace open at either end, closures for these openings, motor means for operating the closures, mechanism for moving bodies intermittentlyvv through the furnace from one end to the other comprising a carrier, motor means for raising and lowering the carrier when the closures are open, motor means for imparting longitudinal movements to the carrier in one direction when elevated and in the r opposite direction when lowered, and fluid pressure operated means for Controlling the different motor means whereby when a cycle of movements is initiated the closures will be opened, the carrier raised, moved longitudinally in one direction and then lowered,

the closures returned to closed position, and the carrier returned longitudinally to its original position of rest.

MAXVELL F. MAY.

1rolI appears 1n the printed Specification of the abovequl'ng correction as follows: Page fi, line 126, for the Word one read the; and that the said Letters Patent should be read With this correction therein that the same may conform to the record of the case in the Patent Oee.

gned vand Sealed this 8th day of March, A. D. 192.

[SEAL] M. J. MOORE, Acting Commissioner of Patents. 

